If the difference between the reciprocal of a positive proper fraction and the f

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If the difference between the reciprocal of a positive proper fraction and the fraction itself be $$\frac{9}{20}$$, then the fraction is :

Options:

A . $$\frac{3}{5}$$

B . $$\frac{4}{5}$$

C . $$\frac{5}{4}$$

D . $$\frac{3}{10}$$

Answer: Option B

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